Quantitative OCT image correction using Fermat's principle and mapping arrays

Volker Westphal; Sunita Radhakrishnan; Andrew M. Rollins; Joseph A. Izatt

doi:10.1117/12.470461

14 June 2002 Quantitative OCT image correction using Fermat's principle and mapping arrays

Volker Westphal, Sunita Radhakrishnan, Andrew M. Rollins, Joseph A. Izatt

Proceedings Volume 4619, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI; (2002) https://doi.org/10.1117/12.470461
Event: International Symposium on Biomedical Optics, 2002, San Jose, CA, United States

Abstract

Optical coherence tomography (OCT) is a relatively new developed technique to image tissue microstructure in vivo with a resolution of about 10 micrometers . So far, the research has focused on increasing the resolution, increasing the acquisition rate, developing new sample arm scanning techniques, or functional imaging like color Doppler OCT. But one of the main advantages of OCT compared to ultrasound, non-contact imaging, also results in a mayor image distortion: refraction at the air-tissue interface. Also, applied scanning configurations can lead to deformed images. Both errors prevent accurate distance and angle measurements on OCT images, necessary e.g. for Glaucoma diagnosis in the anterior segment of the eye. We describe a methodology for quantitative image correction in OCT which includes procedures for correction of arbitrary spatial warping caused by non-uniform axial reference and lateral sample scan patterns, as well as a novel approach for refraction correction in layered media based on Fermat's principle. The de-warping corrections are implemented in real-time by use of pointer (mapping) arrays, while the refraction correction algorithm is more computationally intensive and is performed off-line.

Citation Download Citation

Volker Westphal, Sunita Radhakrishnan, Andrew M. Rollins, and Joseph A. Izatt "Quantitative OCT image correction using Fermat's principle and mapping arrays", Proc. SPIE 4619, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI, (14 June 2002); https://doi.org/10.1117/12.470461

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